Research ArticleOpen AccessGoogle Scholar indexed
Martensitic Characterization of the Ti<sub>45.3</sub>Ni<sub>54.7</sub> Melt Spun Alloy
- 1
- 2
- 3
Materials Sciences and Applications·Volume 02 (2011)·Pages 1256–1259·Published 27 September 2011·DOI10.4236/msa.2011.29169
Copy link · social · email
Abstract
The ribbons of the Ti<sub>45.3</sub>Ni<sub>54.7</sub> shape memory alloy were prepared through the melt spinning technique. The study was focused on investigating the effect of the rapid solidification and grain size at characteristic start martensitic (M<sub>s</sub>), final martensitic (M<sub>f</sub>), start austenite (A<sub>s</sub>) and final austenite (A<sub>f</sub>) transformation temperatures. Changes on martensitic transformation temperatures in Ti<sub>45</sub>Ni<sub>55</sub> melt spun ribbons were observed as grain size is reduced. Results of optical microscopy and differential scanning calorimetry (DSC) were used to associate grain size with transformation temperatures.
KeywordsShape Memory Ni-Ti AlloyRapid SolidificationMartensitic Transformation
- Y. Freed and J. Aboudi, “Micromechanical Prediction of the Two-Way Shape Memory Effect in Shape Memory Alloy Composites,” International Journal of Solids and Structures, Vol. 46, No. 7-8, January 2009, pp. 1634- 1647. doi:10.1016/j.ijsolstr.2008.12.004
- Y. Bellouard, “Shape Memory Alloys for Microsystems: A Review from a Material Research Perspective,” Materials Science and Engineering, Vol. A481-482, February 2008, pp. 582-589.
- H. Morawiec, J. Lelatko, D. Stróz and M. Gigla, “Structure and Properties of Melt-Spun Cu-Al-Ni Shape Memory Alloys,” Materials Science and Engineering, Vol. A273-275, December 1999, pp. 708-712.
- T. Goryczka and P. Ochin, “Characterization of a Ni50Ti50 Shape Memory Strip Produced by Twin Roll Casting Technique,” Journal of Materials Processing Technology, Vol. 162-163, June 2005, pp. 178-183. doi:10.1016/j.jmatprotec.2005.02.029
- “ASTM Standards: Standards Test Method for Determining Average Grain Size,” Annual book of ASTM standards, 03.01, 2003, p. 256.
- K. N. Lin and S. K. Wu, “Martensitic Transformation of Grain-Size Mixed Ti51Ni49 Melt-Spun Ribbons,” Journal of Alloys and Compounds, Vol. 424, No. 1-2, February 2006, pp. 171-175. doi:10.1016/j.jallcom.2006.01.007
- L. Zhang, C. Xie and J. Wu, “Grain Size Estimations of Annealed Ti-Ni Shape Memory Thin Films,” Journal of Alloys and Compounds, Vol. 432, January 2007, pp. 318-322. doi:10.1016/j.jallcom.2006.06.018
- X. Zhang and H. Sehitoglu, “Crystallography of the B2→R→B19_ Phase Transformations in NiTi,” Materials Science and Engineering, Vol. A 374, No. 1-2, February 2004, pp. 292-302.
- P. Sittner, M. Landa, P. Lukás and V. Novák, “R-Phase Transformation Phenomena in Thermomechanically Loaded NiTi Polycrystals,” Mechanics of Materials, Vol. 38, July 2000, pp. 475-492.
- Y. Zhou, J. Zhang, G. Fan, X. Ding, J. Sun, X. Ren and K. Otsuka, “Origin of 2-Stage R-Phase Transformation in Low-Temperature Aged Ni-rich Ti-Ni Alloys,” Acta Materialia, Vol. 53, January 2005, pp. 5365-5377. doi:10.1016/j.actamat.2005.08.013
- R. Zarnetta, D. K?nig, C. Zamponi, A. Aghajani, J. Frenzel, G. Eggeler and A. Ludwig, “R-Phase Formation in Ti39Ni45Cu16 Shape Memory Thin Films and Bulk Alloys Discovered by Combinatorial Methods,” Acta Materialia, Vol. 57, December 2009, pp. 4169-4177. doi:10.1016/j.actamat.2009.05.014
- W. Cai, Y. Murakami and K. Otsuka, “Study of R-Phase Transformation in a Ti-50.7at%Ni Alloy by In-Situ Transmission Electron Microscopy Observations,” Materials Science and Engineering, Vol. A273-275, January 1999, pp. 186-189.